Billboard changed a rule to allow songs that had not been released as physical singles to chart on the Hot 100, paving the way for songs heavily promoted on radio (even if they weren't available for purchase as a single) and album cuts to chart. The new rule went into effect on December 5, 1998.
This is why Natalie Imbruglia's 'hit' song "Torn" never made the top 40. It was #1 on the Airplay chart for 11 weeks but was dying down by December and debuted at #47. If the rule had been put into effect six months earlier, "Torn" probably would have hit #1 on the Hot 100 too.
Then this happened February 2013, which KILLED the chart....
The Billboard Hot 100 undergoes a major shakeup this week, as YouTube streaming data joins the chart's methodology. Fittingly, "Harlem Shake," the viral smash from Brooklyn producer Baauer, roars onto the ranking at No. 1.
As announced today, Billboard and Nielsen have revealed that U.S. YouTube video streaming data has been added to multiple platforms, which includes an update to the formula for the five-decade-old Hot 100. YouTube streaming data is now factored into the chart, enhancing a recipe that includes digital download track sales (and physical singles sales), as tracked by Nielsen SoundScan, as well as terrestrial radio airplay, on-demand audio streaming, and online radio streaming, as tracked by Nielsen.
As "Shake" takes over atop the Hot 100 (and Dance/Electronic Songs, where it leaps from No. 12), it dethrones Macklemore & Ryan Lewis' "Thrift Shop," featuring Wanz, after a four-week reign. Showing just how strong "Shake" is in streaming, "Shop" registered an impressive 10.1 million streams in the chart's tracking week (dipping 1-2 on Streaming Songs), but the figure is clearly exponentially lower than the 103 million for "Shake." "Shake," in fact, leads the Hot 100 with three-and-a-half times the overall chart points total of "Shop."
So now ever time Taylor/Drake/Kendrick release an album, every song from it debuts in the top 40 based on streaming.